The Europe-Russia-Japan (ERJ) is an Eurasia cable route seamlessly combining TTK's terrestrial backbone network across Russia to Europe, and the HSCS cable system between Russia and Japan jointly built by TTK and NTT.

The HSCS was upgraded with 200 Gbps DWDM technology for a total system capacity up to 5.4 Tbps in 2018.

The ERJ cable offers a low latency route from Europe to Japan, with latency (RTD) of 144ms between Tokyo and Amsterdan.

TTK offers other Eurasia terrestrial cable routes to China, Europe-Russia-Asia (ERA)  and Europe-Russia-Mongolia-Asia (ERMC) .